Kaizen Sudoku: Smart Hints

Now 100% ad-free! New daily challenge available—build your streak today.

Kaizen Sudoku is the calm, 100% ad-free and completely free Sudoku game where beautiful design, smart learning, and unlimited puzzles come together—no ads, no subscriptions, no paywalls, ever. Master classic Sudoku one puzzle at a time.

Every hint teaches a real Sudoku technique—explaining why a move works instead of simply revealing the answer. Six difficulty levels from Beginner to Legend, 21 hand-crafted themes, and a distraction-free design make every game a pleasure.

LEARN AS YOU PLAY Go beyond trial and error. Smart hints teach proven solving techniques, sharpen your logic skills, and help you become a stronger Sudoku player with every puzzle you solve.

DAILY SUDOKU CHALLENGE A new puzzle every day. Keep your streak alive, earn monthly trophies, and make Sudoku part of your daily routine.

100% AD-FREE, COMPLETELY FREE Every feature, every theme, and every difficulty level is unlocked from the start. No ads, no subscriptions, and no paywalls. Earn points as you solve puzzles and spend them on extra hints whenever you need them.

PLAY YOUR WAY Pencil notes with auto-clear, undo without limits, optional mistake highlighting, detailed statistics, and Game Center leaderboards give you full control over every game. Keep multiple puzzles in progress and pick up right where you left off—even offline.

DESIGNED FOR CALM 21 hand-crafted themes with night variants, soft colors, and carefully chosen typography create a relaxing place to focus. No clutter, no interruptions—just you and the puzzle.

From your first Sudoku to your thousandth, from a quick Daily Challenge to a deep Legend puzzle, Kaizen Sudoku helps you improve while making every game enjoyable.